What engine is needed to power an AR RSV4G40 pump?

An engine delivering between 13.0 and 15.0 gross horsepower with a 1-inch horizontal keyed shaft is required to drive the AR RSV4G40 at full 4000 PSI / 4.0 GPM capacity. Industry standard pairings include the Honda GX390 (389cc), Kohler CH440, and Predator 420cc.

What is the EZ Start unloader feature on the AR RSV4G40?

The EZ Start unloader mechanism relieves initial water head resistance in the pump cylinders while the engine recoil rope is pulled. This prevents high hydraulic backpressure from snapping the starter cord or locking the engine during pull-starting.

ARCHETYPE C: DROP-IN COMPONENT SPECIFICATIONS

AR North America RSV4G40D-F40 EZ Triplex Pump

Technical engineering submittal breakdown: 4000 PSI @ 4.0 GPM hydraulic performance, 1" hollow shaft gas engine mounting, forged brass manifold, solid ceramic plungers, and integrated EZ start unloader.

SKU: AR-RSV4G40-EZ

AR RSV4G40 Commercial Triplex Pump

Direct Replacement for Simpson AAA 90034, Cat Pumps 66DX40GG1, General Pump EZ4040G

PRICING CLASSIFICATION Commercial Grade (Live Pricing on Amazon) Check Current Price & Prime

Submittal Engineering Specifications

Submittal Parameter	Manufacturer Specification	Operational Engineering Benefit
Maximum Working Pressure	`4000 PSI (275 bar)`	Commercial surface cleaning, concrete stripping, and paint prep power.
Discharge Flow Rate	`4.0 GPM (15.1 LPM)`	Powers 20-inch dual-nozzle rotary surface cleaners without pressure loss.
Shaft Diameter & Interface	`1.000" Hollow Shaft` with 1/4" keyway	Direct slide-on fit for 9HP to 15HP horizontal gas engine crankshafts.
Drive Operating Speed	3400 RPM Direct Drive	Eliminates heavy gearboxes or belt maintenance; direct bolt to engine face.
Engine Flange Pattern	SAE J609a Gas Flange (5.0" BCD)	Standard 4-bolt circle matching Honda GX390, Kohler, and Predator.
Manifold Metallurgy	Forged Solid Brass	Withstands continuous 4000 PSI fatigue pressure without body flexing.
Plunger Construction	Concentric Solid Ceramic Sleeves	Extreme hardness resists abrasion from fine silt; zero thermal distortion.
Integrated Unloader Valve	Built-in EZ Start Unloader with Knob	Bypasses line pressure during pull-start; permits micro-pressure adjustment.
Fluid Ports	3/8" QC Female Outlet \| 3/4" GHT Female Inlet	Standard industrial high-pressure hose and garden hose connections.
Thermal Relief Protection	1/4" NPT Pre-tapped Port	Accepts thermal relief valve to dump scalding water in bypass mode.

Alternative Drop-in Bolt-on Commercial Pumps

If the AR RSV4G40 is out of stock, these commercial units share the identical 1" shaft and 5" BCD engine flange:

Model	Brand	Pressure / Flow	Shaft Size	Engine Flange	Action
Cat Pumps 66DX40GG1	Cat Pumps	4000 PSI / 4.0 GPM	1" Hollow (3400 RPM)	5" BCD (SAE J609a)	View Cat 66DX
General Pump EZ4040G	General Pump	4000 PSI / 4.0 GPM	1" Hollow (3400 RPM)	5" BCD (SAE J609a)	View General Pump
Simpson AAA 90034	Simpson / FNA	4000 PSI / 3.5 GPM	1" Hollow (3400 RPM)	5" BCD (SAE J609a)	View AAA Triplex